Spider-Man Fan Art - Save Gwen Scene

liketotallyakid

I really don't know how to make this better, if you have any suggestions or any critiques at all, please help me out   

this is a really old piece i did, and when i look at it i'm still not happy with it, but i don't know what is off about it. i even knew i'd run into this problem, so that's why i copied the scene from the actual movie (it's in the trailer too when he's on the clocktower leaping in the air to catch Gwen from falling down)

if anything stands out to you, please let me know i will be extremely grateful to you.
Also, if this forum is not the right place for questions like this, somebody call me out on it, and i'm really sorry.

All the best, 
Dragos